The StretchTimer is meant to support prolonged practice sessions. Just set the time, you want to stretch. Also, set the time you need to change positions. As default, two minutes for stretching and ten seconds for changing positions have proven to be sufficient. The app will signal you accoustically at the beginning of every exercise- and changecylce. Therefore, you don‘t have to worry about time-measurement and you can focus entirely on relaxing the stretched muscles and deep, regularly breathing.